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O-Rings

Among the myriad of different O-Ring dimension standards available, the AS568 is the United States’ most popular. It was previously designated as ARP 568 and is now maintained by the Society of Automotive Engineers. AS568 lists 369 different sizes of O-Rings with corresponding tolerances and dimensions. This standard features O-Rings in five different cross-sections, with inside diameters that range from 1/32” to 26”. Tube fitting boss seals are also included in AS568 as “-900” series O-Ring sizes, intended for use in MS33649 (superseded now by SAE-AS5202) straight thread tube fittings.

In addition, J Royal offers a wide variety of metric and non-standard O-Rings. As a subset of the available metric sizes, J Royal stocks several Japanese Industrial Standard (JIS B2401) sizes. If you require a special size or specific chemical resistance, J Royal can create custom O-Rings, specially made to your specific requirements.

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O-Rings For Straight Thread Tube Fitting Bosses

Tube Size

Dimensions in Inches

Dimensions in Millimeters

AS568A

Dash #

O.D

Vol. (in³)

I.D.

±

C/S

±

I.D.

±

C/S

±

901

3/32

.0019

.185

.005

.056

.003

4.70

0.13

1.42

0.08

902

2

1/8

.0031

.239

.005

.064

.003

6.07

0.13

1.63

0.08

903

3

3/16

.0037

.301

.005

.064

.003

7.65

0.13

1.63

0.08

904

4

1/4

.0054

.351

.005

.072

.003

8.90

0.13

1.83

0.08

905

5

5/16

.0062

.414

.005

.072

.003

10.51

0.13

1.83

0.08

906

6

3/8

.0082

.468

.005

.078

.003

11.90

0.13

1.98

0.08

907

7/16

.0102

.530

.007

.082

.003

13.46

0.18

2.08

0.08

908

8

1/2

.0137

.644

.009

.087

.003

16.36

0.23

2.20

0.08

909

9/16

.0186

.706

.009

.097

.003

17.93

0.23

2.46

0.08

910

10

5/8

.0198

.755

.009

.097

.003

19.18

0.23

2.46

0.08

911

11/16

.0326

.863

.009

.116

.004

21.92

0.23

2.95

0.10

912

12

3/4

.0345

.924

.009

.116

.004

23.47

0.23

2.95

0.10

913

13/16

.0366

.986

.010

.116

.004

25.04

0.25

2.95

0.10

914

7/8

.0386

1.047

.010

.116

.004

26.62

0.25

2.95

0.10

916

16

1

.0427

1.171

.010

.116

.004

29.74

0.25

2.95

0.10

918

1-1/8

.0489

1.355

.012

.116

.004

34.42

0.30

2.95

0.10

920

20

1-1/4

.0547

1.475

.014

.118

.004

37.46

0.36

3.00

0.10

924

24

1-1/2

.0631

1.720

.014

.118

.004

43.70

0.36

3.00

0.10

928

28

1-3/4

.0759

2.090

.018

.118

.004

53.10

0.46

3.00

0.10

932

32

2

.0843

2.337

.018

.118

.004

59.36

0.46

3.00

0.10

The 900 series boss seals are designed to seal straight thread tube fittings when they are fastened into a boss. In this type of fitting the O-Ring is not located in a conventional rectangular groove. Rather, the seal is obtained when the gland components exert a diagonal squeeze through the O-Ring cross section.